Screw cap



FIG. 1 is a front, elevation view of the screw cap;

FIG. 2 is a rear, elevation view of the screw cap;

FIG. 3 is a right side, elevation view of the screw cap;

FIG. 4 is a left side, elevation view of the screw cap;

FIG. 5 is a top, plan view of the screw cap;

FIG. 6 is a bottom, plan view of the screw cap;

FIG. 7 is a cross-sectional view taken along the line 7—7 of FIG. 5;

FIG. 8 is a cross-sectional view taken along the line 8—8 of FIG. 5; and,

FIG. 9 is a perspective view of the screw cap that is screwed onto a leading end of a test tube.

The broken lines in the drawings depict environmental subject matter only and form no part of the claimed design. 

The ornamental design for a screw cap, as shown and described. 